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Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. When completing the job together, which expression would be used to represent the amount of work done by person 1?

21
1/21
x/21
21x

User Jbalsas
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2 Answers

2 votes
The amount of work (or the rate) done by the first person is 1/21
r = 1/21
User Smriti
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4 votes

Answer:


(1)/(21) would be used to represent the amount of work done by person 1.

Explanation:

When someone does a work in x time,

Then, the work done by the person in one day =
(1)/(x)

Given,

Time taken by person 1 = 21 minutes

Thus, by the above statement,

The one day work of person 1 =
(1)/(21)

Hence,
(1)/(21) would be used to represent the amount of work done by person 1.

Second option is correct.

User Marika Blum
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